The zero calorie drinks are water (zero calorie) with a zero calorie artificial sweetener. Food is more complex than just water. There are fats and proteins and sugars, etc. Calories is a measurement of the energy the food can be broken down into during digestion. Eating a food without calories would give you no energy. Processing a food so it had zero calories would leave nothing you would want to eat. Think foam or sawdust. Indigestible.
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